Electrocatalytic oxidation treating method and system of cyanide-containing wastewater

An electrocatalytic oxidation and treatment system technology, which is applied in the field of electrocatalytic oxidation treatment methods and systems for cyanide-containing wastewater, can solve the problems of rising chemical raw material prices, strong chemical dependence, and high treatment costs, and achieves complete removal of cyanide and chemical dependence. The effect of low performance and simple system

Pending Publication Date: 2019-05-28
JIANGSU JINGYUAN ENVIRONMENTAL PROTECTION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Regardless of the "secondary cyanide breaking method" or the "first cyanogen breaking method", the treatment process requires the addition of oxidants, such as sodium hypochlorite, hydrogen peroxide, etc., which is highly dependent on chemicals and hi

Method used

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  • Electrocatalytic oxidation treating method and system of cyanide-containing wastewater
  • Electrocatalytic oxidation treating method and system of cyanide-containing wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0091] Such as figure 1 , 2 Shown, a kind of cyanogen-containing wastewater electrocatalytic oxidation treatment method, concrete steps are:

[0092] 1) Transporting cyanide-containing wastewater to the electrocatalytic oxidation reactor 2;

[0093] 2) In the electrocatalytic oxidation reactor 2, the cyanide-containing wastewater is electrocatalytically oxidized;

[0094] 3) enter in the coagulation reaction box 3, carry out neutralization reaction;

[0095] 4) enter in clarifier 4, clarify;

[0096] 5) Enter the biochemical treatment device 5 for biochemical treatment.

[0097] In order to further explain this embodiment, it should be noted that,

[0098] In step 1), the cyanide-containing waste water enters the pipeline mixer 208 from the water inlet 210, and after mixing with the circulating waste water in the circulating pipe 207, enters the reactor box 201 of the electrocatalytic oxidation reactor 2 from the circulating water inlet 212;

[0099] In step 2), the elec...

Embodiment 2

[0128] Such as figure 1 , 2 As shown, an electrocatalytic oxidation treatment system for cyanide-containing wastewater includes a delivery pump 1, an electrocatalytic oxidation reactor 2, a coagulation reaction box 3, a clarifier 4, and a biochemical treatment device 5;

[0129] The delivery pump 1 is connected to the electrocatalytic oxidation reactor 2, and is used to transport cyanide-containing wastewater;

[0130] The electrocatalytic oxidation reactor 2 is connected with the coagulation reaction box 3, and is used for electrocatalytic oxidation of cyanide-containing wastewater;

[0131] The coagulation reaction box 3 is connected with the clarifier 4, and is used to convert free heavy metals into sediments by inputting lime milk or liquid caustic soda, coagulant and coagulant aid;

[0132] The clarifier 4 is connected with the biochemical treatment device 5, and is used to obtain clear water through clarification;

[0133] The biochemical treatment device 5 is used to...

Embodiment 3

[0160] Such as figure 1 , 2 Shown, a kind of cyanide-containing wastewater electrocatalytic oxidation treatment method, cyanide-containing wastewater is cyanide copper plating process manual production line wastewater, CN group concentration 400mg / L, total copper 165mg / L, pH between 9 ~ 10, COD Around 1000mg / L, total nitrogen 250mg / L, total phosphorus 30mg / L, conductivity 5000μS / cm. The cyanide-containing wastewater is transported to the pipeline mixer 208 through the transport pump 1, mixed with the circulating water and then enters the electrocatalytic oxidation reactor 2 along the circulating water inlet 212, the circulating water inlet flow ratio is 8:1, and the control voltage is 6.5V~ The electrocatalytic oxidation reaction is carried out between 7.5V, the CN group concentration in the reactor is reduced to less than 0.2mg / L, and the waste water that has completed the "cyanide breaking" process flows out from the water outlet 211.

[0161] The waste water flowing out f...

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Abstract

The invention discloses an electrocatalytic oxidation treating method and system of cyanide-containing wastewater. An inactive metallic oxide with catalytic ability is adopted as an electrode, intermediate products of hydroxyl radical and the like with strong oxidizing property are formed through catalyzing under the electric field action, and the cyanide in the cyanide-containing wastewater reacts with the intermediate products to be oxidized into micromolecules of carbon dioxide, nitrogen, water and the like, thereby achieving the purpose of cyanide breaking. The electrocatalytic oxidation treating method and system of cyanide-containing wastewater has the advantages that feeding of an oxidizing agent is not needed, reaction conditions are mild, cyanide is removed thoroughly, operation cost is low, the system is simple, steady and reliable, the degree of automation is high and the like.

Description

technical field [0001] The invention belongs to the field of environmental engineering and relates to an electrocatalytic oxidation treatment method and system for cyanide-containing wastewater. Background technique [0002] Cyanide-containing wastewater refers to industrial wastewater containing CN groups. Because the cyano group has strong complexation, it is widely used in the extraction of gold, silver and copper from non-ferrous metal minerals, cyanide electroplating, chemical industry, coking, heat treatment and other industries, and a large amount of cyanide-containing wastewater is discharged in the production process. Cyanide-containing compounds are highly toxic substances. CN combines with ferricytochrome oxidase in the human body to generate cyanide ferricytochrome oxidase and loses the oxygen transfer function, causing tissue hypoxia and asphyxia in the body. The lethal dose of cyanide to human varies from person to person, about 0.5mg / kg~3.5mg / kg, and the leth...

Claims

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Application Information

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IPC IPC(8): C02F9/14C02F101/18C02F103/16
Inventor 李武林姚志全何家平朱琼芳袁志清游智林陈晓锋王金雷
Owner JIANGSU JINGYUAN ENVIRONMENTAL PROTECTION
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